Annealing apparatus



Original Filed Feb. 21

lwenor:

G /EL J. TOLL, waw

Patented Oct. 3, 1939 PATENT 'OFFICE 2474542 ANNEALING APPARATUS Carl J. Toll, Worcester, Mass., assignor to The American Steel and Wire Company of New Jersey, a corporation of NewJersey Original application February 21, 1935, Serial No. 7,618. Divided and this application December 13, 1935, -Serial No. 54,337

2 Claims.

This invention is a division from my co-pending application entitled "Annealing", filed. February 21, 1935, and hearing Serial No. 7,618, matured in Patent No. 2,144,904, dated Jan. 24, 1939,

and relates in general to annealing. It-is particularly concerned with box or pot annealing, one of the objects being to pot anneal high carbon steel, wire or strip. Other objects may be inferred.

According to the invention, wire is loaded onto an annealing pot and supported in spaced relationship respecting the entire inside of the latter during the annealing operation. This is done to permit the gases enclosed in the pot to circulate more freely. Granular or porous carbonaceous material, such as charcoal, is then arranged in the pot so that the' gases may contact therewith during the annealing operation. All leaks between the inside and outside of the pot are then sealed With carbonaceous material, and a cover is provided so as to protect it from the furnace atmosphere.

Annealing is conducted in the `usual`manner after the above acts have been performed. No

appreciable decarburization of the charge -will occur during this operation;

In the accompanyng drawing, Figure 1 is a cross-section and Figure 2 a vertical section of an annealing pot that is expressly designed to 0 accommodate the practice which has been described.

The drawing shows an annealing pot I that is distinguished by being of somewhat larger diameter than the usual pot and by having a top providing at least two closure seats 2 and 3. Also, the pot has an apertured internal shell t spaced from its inside, this shell being adapted to position the required granular or porou`s material between it and the inside of the walls of the pot. This shell is provided with outwardly extending flanges 5 which serve to maintain the shell and pot in concentric relation, and apertures a so that at least a portion of the gases enclosed by the pot can circulate therethrough and' mingle with the carbonaceous material contained therein. The diameter of this shell is such as ,to permit loading of coils of wire 6.

'specting the entire inside of the pot l, whereby the gases' enclosed by the latter may circulate more freely.

A first closure 8 is laid on the lower closure 10 seat 2 and a second closure 9 is laid on the upper seat 3. Both of these closures may be concentrically apertured so as to permit the insertion of a thermocouple IO into the pot. It is to be noted that both the closures 8 and 9 are 15 so constructed and arranged that both may be sealed with granular material.

In following 'the method described, the material positioned by the shell 4 may be any granular or porous material that is high in carbon. 20 The' granular material which seals the closure 8 should also be of a carbonaceous character. The upper closure 9 may be seald with a metallic oxide or any suitable refractory, whereby it :functions to protect the carbonaceous material 25 sealing the lower closure 8 from the furnace atmosphere.

I claim:

1. Annealing apparatus including a chamber for annealing articles, a, gas flue centrally ar- 30 ranged in said chamber and opening therein adjacent its top and bottom, means for supporting carbonaceous material in said chamber with aper tures in said means for enabling gases in said flue to mingle through and about said carbonaceous material and chamber, respectively.

2. Annealing apparatus comprising, in combination, a, container, a ventilated raised platform centrally arranged in said container, a vertical hollow column associated with said platform and communicating with the under side thereof, a perforate hollow cylinder concentrically disposed relative to said container and column, and arranged intermediately of the'adjacent faces of the side walls thereof.

' CARL J. TOLL. 

